Tooth-crown model.



- No. 853,984. PATBNTBD MAY 21-. 1907 I G.F.LAUDEBDA LE.

001311 GROWN MODEL.

Arrmmnon FILED main, 190s.

' [NVZ'NTOR WJTIVESSES;

A HORN 5Y5 contact wit all whom it may concern.

Be it known" that I, OHAPIN F. LAUDER- ALE, a citizen of the United Stateareeiding at Milwaukee, in the county of Milwaukee and State-of WVisconsin, have invented a new and useful Tooth-Grown Model, ofwhich the following is a specification.

The principal object of the present inven.-' t1on 1s to provlde' a tooth crown model made of an elastic or ieldable material which will permit ready a .aptation to the shape of the root to which it is to be applied, the 'ap roximating teeth and the antagonizing teetli, .this crown model being subsequently used in the formation of aseamless'metal crown of any suitable material.

A further object of the invention is to provide a flexible crown; model which is in the form of a hollow shell ,to permit ready adap-' tationto the adjacent teeth, and which may bepositivel'zheld in the shape determined by the adjacent teeth by means of a plastic material which is inserted within. the crown, and serves when set or hardened to hold the latter in anyform to which it may be adjusted." I

With these and other objects in view, as will more fully hereinafter appear, the invention consists In certain novel features of construction and arran e'ment of'parts, hereinafter fully described, illustrated-in. the accompanying drawings. and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of the structure may be'made without departing from the spirit or sacrificing any of the adsurface of an antagonizing tooth or teeth. Q

vantages of the invention.

In the accompanying drawings :Figure I is a perspective viewof the buccal face ofa crown model made in accordance with the invention; Fig. 2 is a sectional view ofthe same as applied to the root of a tooth, and before the closing of the jaws to secure cor, rect shaping of the crown'model. Fig. 3 is a view similar to Fig. 2 showing the jaws closed. the crown model properly shaped, and the filling of plastic material inserted for the purpose of holding a model in its correctform. Fig. 4 is a sectional perspective view of the complete crown model which is subsequently used for the formation of a metal crown.

Similar numerals of'reference are employed to indicate corresponding parts throughout the several. figures of the drawings.

UNITED STATESv Specification of Letters Patent. 4 Application and [arch '1, 1906. Sex-id No. 304.705.

crown models are ma nent crown.

PATENT: OFFICE. CHAPIN F. LAUDERDALE, or M'ILWAU'K'EE, 'wrsoonslN TooTH-oRow noosL. a

- Patented May 21, 1907.

' In carrying out the gresenflinvention, e of a number of shapes and sizes corresponding approximately to the shapes of the different teeth of the upper and lower jaws, that illustrated in the present instance conforming to one of the inferior molars. rubber. or other suitable flexible elastic material and are in the form of thin shells, the thickness of the shells being approximately equal to the thickness of the metal subsequently used in the formation of the perma- The models are made of considerable length, so that the lower edge may be trimmed off to follow the line of the gums, and in the outer face of the model is formed an opening 11 by which afilling of some plastic material may be subsequently introduced.

In carrying out theinvention, the root :1 of the tooth to be crowned is ground or shaped. in the usual manner, after which a crown model which conforms generally to the the jaws are closed for the purpose of shaping the model to secure correct occlusion with antagonizing teeth and proper-contact with a proximating teeth, and as the crown mo el is formed of yieldable material, and is approximately of the finished. or natural shape,

it will readily adapt itself to the occluding When this adjustment is secured, the jaws I are held closed as shown in Fig. 3, and then a quantity of plastic material y is (preferably.

an oxyphosphate ofzinc cement). inserted through the opening 11 and allowed to set or harden. This material clings to the inner wall of the elastic shell and holds the same in the position to which it is adjusted, and at. the same time makes a correct impression of the upper surface of theroot of the tooth to which the crown is to be applied. The finished model or pattern is then removed and the metal crown is formed'bfy any of the ordi- I nar processes, it being pre rable, of course, to orm one piece or seamless crowns.

In practice, a variety of crown models are employed to conforma roximately to the g f? 518 teeth, and these general style or shape 0 These models are formed of' are made of sufiicient length and 'el'eisticity to readily adapt themselves to a variety of sizes and peculiarities; v 1 1 In practice it may be'sufiicients to employ one form for the incisors, a-seoondjform for the canine, a vthird for the bieuspids', andp a" fourth for the molars, although thesemay be added vto in accordancewith the fere ces in the type of molars, bic'uspids, and" theike. The claims in the present case; have. been limited to the article, no claims for "the method being included inthe present appli' cation. 1

I claim v 1. As a new article of manufacture, a tooth 3,. Atooth'crownmodel formed of a cap of flexible material arranged to fit over a root to be orewned, and provided with an opening for the insertion ofa plastic material.

' flntestimony'that I claim the foregoing as any ow'ngl have hereto affixed my signature 1 the presence of two witnesses. I

OHAPIN F.'LAUDERDALE.

Witnesses: v.

. CHAS; F -Aruqouzv, y W. L. CHENEY.

crowp model formed of a hollow cap of flexi- "bie non-metallic material. 1 As. anewiarticle of manufacture, a tooth crown modf'e jhfomied of a hollow cap of soft ruhbe X-" 

